Compensation During Use for the Magnetic Annealing of a Magnetoresistive Sensor
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
A method to continuously compensate for the effects of use-related magnetic annealing of the magnetoresistive (MR) material in an MR sensor is disclosed. It uses an adjacent conductive bias layer (BL) that is electrically isolated from the MR material to provide a bias magnetic field to rotate the MR magnetization (M) to the angle where optimal sensing occurs. As the MR material anneals, its easy axis and anisotropy field change, but by varying the current through the bias layer the optimal signal symmetry can be continuously maintained.